Cut-off valve



Aug. 21, 1928. 1,681,372

C. F. SMITH CUT-OFF VALVE Filed Aug. 28, 1924 Patented Aug. 21, 1928.

UNITED STATES CLINTON F. SMITH, OF BOSTON, MASSACI IUSETTS.

CUT-OFF VALVE.

Application filed August as, 1924. Serial No. 734,699.

ceptacle to eliminate the danger of ignition of this body of oil.

A further object of the invention is to providea cutoff valve controlled by a traveling weight of the ball type normally set to employ the weight of the ball to hold the valve in open or feeding position and movable un der the influence of a buoyant ball to close the valve.

WVith these and other objects in view, the invention comprises certain novel parts, elements, units, combinations, constructions, interactions and functions as disclosed in the drawings together with mechanical and functional equivalents thereof as will be hereinafter more fully described and claimed.

In the drawings: a

Figure 1 is a view in side elevation of the improved cutoff control connected with a conventional burner in operative relation.

Figure 2 is a vertical diametrical sectional view through the buoyant chamber and valve controlling lever.

Figure 3 is a fragmentarytop plan view.

Like characters of reference lndicate corresponding parts throughout the several views.

It is well known that in the use of oil as a heating medium for such purposes as heating buildings and the like, a burner of some type is employed which in the present instance is shown conventionally at 10, it being understood that this particular showing represents in the present case no particular type of burner. The fuel oil is supplied to the burner through a pipe 11 which discharges normally to means for vaporizing, but in case of the flow of oil when not ignited dis charges into a receptacle 12 which communicates with an overflow pipe 13.

In the run of pipe from the reservoir, not shown, as indicated at 14, a valve 15 is introduced by means of a housing 16, said valve being fulcrumed in the particular type shown at 17 which is also the fulcruming of the lever 18. The present invention is in no way limited to the specific type of valve employed but in such specific type the port 19 communicates with the supply pipe 11 and the valve 15 is adapted, whenmoved from normal as shown at Figure 2, to close said port and whollyand completely interrupt the flow of fuel from the pipe 14 to and through the pipe 11 and to the burner.

Mounted upon this lever 18. is a tube 20 se cured in any approved manner as by the collar 21 and yoke 22 a pin 23 being employed at the open end for closing the tube against the release of the ball 21 which is proportioned and mounted to roll within the tube 20.

As will be noted from Figure 2, the normal position of the tube 20 is such as to incline slightly downward at the end shown as occupied by the ball 24 so that the weight of the ball tends to hold the valve 15 normally open as shown. When the lever 18 is moved upon its pivot to change the inclined position of the tube 20 to a slight inclination in the opposite direction, the ball 24 rolls to the opposite end of the tube 20 and adds its weight to overbalance the lever 18 and close the valve 15.

To cause this action of the tube 20, lever 18 and ball 24, a float receptacle 25 is employed into which the overflow pipe 13 is introduced and which is incidentally also provided with a drain cock 26 manually operable.

' \Vithin this float chamber 25 a bouyant ball 27 is mounted, rigidly attached to a stem 28 which extends upwardly through the cover 29 of the chamber so that the contents of the 5% chamber is wholly closed from the outside air the chamber 25 rises, it raises the ball 27 as,

for instance, to the dotted position shown at Figure 2 whereupon the lifting effect applied to the lever 18 causes the said lever to oscillate slightly upon its pivot which is the fulcrum of the valve 15, causing the ball to roll to the opposite end of the tube and, therefore, instantly close the valve 15.

It will be obvious that this valve can not be reset to feeding position unless the oil contents of the chamber 25 be manually drained by operating the cock 26 to lower the ball 27 whereupon the lever 18 may be manually returned to normal position as shown at Figure 2, which is the feeding position and at which position it will remain until again closed by the overflow.

WVhat I claim to be new is:

1'. A cutoff for fluid burners comprising, in

combination, a feed pipe, a float chamber, an overflow pipe eonnnunicating with the float chamber, a buoyant body located in the float chamber, a stem carried by the buoyant body slidable through an opening in the chamber Villl, a valve located in the feed pipe, a lever covered by the valve, a normally substantially horizontal run Way rigidly connected with the lever, a Weight mounted to travel in the run way at one limit of its movement tending to hold the valve open and at the opposite limit tending to close the valve, and means carried by the lever interposed diseonnectedly in the path of movement of the stem converting said stem movement into a movement of the run vvay to initiate the closing movement of the traveling Weight, the movement of Which tends to complete the closing of the valve.

2. A cutoit' for fluid burners comprising a feed pipe, a float chamber, a buoyant body located in the float chamber, an overflow pipe communicating with the float chamber, a cover for the float chamber )rovided with an orifice, a valve located in the feed pipe and closed by an oscillating movement, a lever employing the valve as a fulcrum and extending upon opposite sides thereof, a normally substantially horizontal run way mounted upon the lever extending unequal distances upon opposite sides of the fulcrum, a traveling Weight moving in the run \vay tending at one limit of its movement at the shorter end to hold the valve open and at its opposite limit at the longer end to close the valve, a stem carried by the buoyant member slidable longitudinally through the orifice and direeted to engage (lisconnectedly against the lever to initiate the closing movement of the traveling Weight which said movement tends to complete the closing of the valve.

In testimony whereof l allix my signature.

CLINTON F. SMITH. 

